Summary

Speaker port flare that you can customize to your port specs. I just have mine held on with friction fit. It got rid of quite a bit of the chuffing noise but didn't completely eliminate it. Mine was used on the 1 5/8 port from Parts Express: https://www.parts-express.com/Port-Tube-1-5-8-ID-x-4-7-8-L-Flared-260-474?quantity=1

Looks kind of goofy but it works!